adjective, adverb
on or at the top.
on the top of: atop the flagpole.

1650–60; a-1 + top1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atop (əˈtɒp)
1.  on top; at the top
2.  on top of; at the top of

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1650s, from a- (1) + top. Two words or hyphenated at first; not fully established as one word till late 19c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
To create your own instant workspace anywhere, put a flat birch hollow-core
  door atop two adjustable sawhorses.
Sitting atop the narrow shelf above the sink, imperfect teacups make good
  holders for air plants.
Center the large pot atop the steel mesh and slide it down the tubing until it
  sits firmly on the mesh.
Current reality does appear to perch humans atop a planetary food chain.
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